:root {
  --bg: #0d1526;
  --card-bg: #141d33;
  --border: #263149;
  --text: #f2f4f8;
  --text-dim: #a7b0c4;
  --orange: #ff5a3c;
  --purple: #7c5cff;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
  position: relative;
}

.blob {
  position: fixed;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.35;
  z-index: 0;
  pointer-events: none;
}

.blob-orange {
  width: 480px;
  height: 480px;
  background: var(--orange);
  top: -160px;
  left: -160px;
}

.blob-purple {
  width: 520px;
  height: 520px;
  background: var(--purple);
  bottom: -200px;
  right: -180px;
}

.card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 560px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 48px 40px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  text-align: center;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 28px;
}

.logo .accent {
  color: var(--orange);
}

.check {
  color: #3ddc84;
  margin-bottom: 8px;
}

h1 {
  font-size: 26px;
  margin: 8px 0 12px;
}

.lead {
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.5;
  margin: 0 0 32px;
}

.steps {
  text-align: left;
  margin: 0 0 32px;
  padding-left: 22px;
  color: var(--text);
  font-size: 14px;
  line-height: 1.7;
}

.steps li {
  margin-bottom: 6px;
}

.steps code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 13px;
}

.downloads {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 28px;
}

.btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 12px 18px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  transition: background 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn span {
  font-weight: 400;
  font-size: 12px;
  color: var(--text-dim);
}

.btn-primary {
  background: linear-gradient(135deg, var(--orange), #ff8a3c);
  border-color: transparent;
  color: #1a0f0a;
}

.btn-primary span {
  color: rgba(26, 15, 10, 0.7);
}

.btn-primary:hover {
  filter: brightness(1.05);
}

.alt-os {
  text-align: left;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px 16px;
  margin-bottom: 24px;
}

.alt-os summary {
  cursor: pointer;
  padding: 12px 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dim);
}

.alt-os[open] summary {
  color: var(--text);
}

.alt-os .alt-lead {
  margin: 0 0 16px;
  font-size: 13px;
}

.alt-os .alt-lead a {
  color: var(--orange);
}

.alt-os .steps {
  font-size: 13px;
}

.alt-os .downloads {
  margin-bottom: 16px;
}

.support {
  font-size: 13px;
  color: var(--text-dim);
  margin: 0;
}

.support a {
  color: var(--text);
}

@media (max-width: 480px) {
  .card {
    padding: 36px 24px;
  }
}